from django.shortcuts import render,reverse
from django.http import HttpResponse
from myweb.settings import BASE_DIR
import os,time

# Create your views here.
# 后台首页
def index(request):

    return render(request,'myadmin/index.html')

# 后台登录
def myadminlogin(request):
    if request.method == 'GET':
        # 显示一个登录的页面
        return render(request,'myadmin/login.html')
    else:
        # 执行登录

        # 判断验证码是否正确
        if request.POST['code'] != request.session['verifycode'] :
            return HttpResponse('<script>alert("验证码错误");location="'+reverse("myadmin_login")+'";</script>')


        # 验证码用户名和密码是否正确
        if request.POST['name'] == 'admin' and request.POST['password'] == '123456':
            # 执行登录
            # 把登录信息写入session中
            request.session['AdminUser'] = {'name':'admin'}
            return HttpResponse('<script>alert("登录成功");location.href="/myadmin/";</script>')

# 后台退出登录
def myadminlogout(request):
    request.session['AdminUser'] = ''
    return HttpResponse('<script>alert("退出登录");location.href="/myadmin/login/";</script>')


# 封装函数进行文件上传
def uploads(myfile):
    filename = str(time.time()) + "." + myfile.name.split('.').pop()
    destination = open(BASE_DIR + "/static/up_pics/" + filename, "wb+")
    for chunk in myfile.chunks():  # 分块写入文件
        destination.write(chunk)
    destination.close()
    return "/static/up_pics/" + filename


# 验证码
def logincode(request):
    #引入绘图模块
    from PIL import Image, ImageDraw, ImageFont
    #引入随机函数模块
    import random
    #定义变量，用于画面的背景色、宽、高
    bgcolor = (random.randrange(20, 100), random.randrange(
        20, 100), 255)
    width = 100
    height = 25
    #创建画面对象
    im = Image.new('RGB', (width, height), bgcolor)
    #创建画笔对象
    draw = ImageDraw.Draw(im)
    #调用画笔的point()函数绘制噪点
    for i in range(0, 100):
        xy = (random.randrange(0, width), random.randrange(0, height))
        fill = (random.randrange(0, 255), 255, random.randrange(0, 255))
        draw.point(xy, fill=fill)
    #定义验证码的备选值
    # str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0'
    str1 = '123456789'
    #随机选取4个值作为验证码
    rand_str = ''
    for i in range(0, 4):
        rand_str += str1[random.randrange(0, len(str1))]
    #构造字体对象
    font = ImageFont.truetype('FreeMono.ttf', 23)
    #构造字体颜色
    fontcolor = (255, random.randrange(0, 255), random.randrange(0, 255))
    #绘制4个字
    draw.text((5, 2), rand_str[0], font=font, fill=fontcolor)
    draw.text((25, 2), rand_str[1], font=font, fill=fontcolor)
    draw.text((50, 2), rand_str[2], font=font, fill=fontcolor)
    draw.text((75, 2), rand_str[3], font=font, fill=fontcolor)
    #释放画笔
    del draw
    #存入session，用于做进一步验证
    request.session['verifycode'] = rand_str
    #内存文件操作
    import io
    buf = io.BytesIO()
    #将图片保存在内存中，文件类型为png
    im.save(buf, 'png')
    #将内存中的图片数据返回给客户端，MIME类型为图片png
    return HttpResponse(buf.getvalue(), 'image/png')